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Blog
October 31, 2026
Sleep apnea and glaucoma are linked in many studies, but the evidence is mixed and does not prove that sleep apnea causes glaucoma [1,2]. CPAP can raise eye pressure slightly in some people, mostly in the first weeks, and no study has shown it makes glaucoma worse [3,4]. Never stop CPAP on your own because of eye pressure; ask your sleep and eye doctors to plan together.
Key takeaways
In this article
This article is general education, not a personal treatment plan. Do not stop CPAP, skip nights or change its settings because of an eye concern. Untreated sleep apnea raises the risk of stroke and heart attack [9].
Sleep apnea and glaucoma are long-term conditions, but some eye symptoms are emergencies. Sudden vision loss needs care the same day, even when it does not hurt. Do not assume a new eye symptom is caused by your CPAP mask.
Call 911
Go to an emergency room or eye emergency clinic now
Call your doctor the same day
Sleep apnea is linked with glaucoma, but it has not been proven to cause it. A 2023 review of 48 studies found that people with OSA had higher odds of glaucoma. After adjusting for age, sex and conditions such as high blood pressure and diabetes, the extra odds were up to 40% [1].
In OSA, the airway narrows or closes again and again during sleep. Breathing stops and starts. Common signs are loud snoring, gasping and daytime sleepiness [14].
Glaucoma is a group of diseases that damage the optic nerve, the cable that carries vision from the eye to the brain. It usually causes no symptoms at first [15].
The research results are mixed. The 2023 review's overall pooled estimate was almost four times the odds, but the studies differed greatly from one another. The estimate fell to up to 40% higher odds when limited to adjusted results [1]. A 2022 review in a sleep medicine journal called the evidence largely low-level and the link weak and contradictory [2].
Several things make the link hard to judge:
For you, this means OSA belongs in your glaucoma history. It does not mean that everyone with sleep apnea will get glaucoma.
Researchers think repeated drops in oxygen during sleep may stress the optic nerve. Other proposed pathways include blood pressure swings, inflammation, oxidative stress and poor control of blood vessels. These ideas are plausible, but there is almost no evidence on whether treating sleep apnea slows eye damage [2].
The optic nerve needs a steady blood supply. Our article on blood flow and the optic nerve explains why vessel control may matter in glaucoma.
CPAP can raise eye pressure slightly in some people, mostly overnight and in the first month. A review of 16 studies found no change after more than a month. Another review found a small rise with long-term use. Neither showed that CPAP makes glaucoma worse [3,4].
CPAP (continuous positive airway pressure) is a machine that blows air through a mask to keep your airway open during sleep. PAP machines such as CPAP are the most common treatment for sleep apnea [16].
| Study | What it included | Main finding on eye pressure | Limits |
|---|---|---|---|
| Chan and colleagues, review, 2026 (online 2025) [3] | 16 studies, 602 people with OSA | Pressure rose overnight and within the first month. No change after more than 1 month. | Measured pressure, not optic nerve damage |
| Kongchan and colleagues, review, 2025 [4] | 15 studies, 495 people with OSA | No significant overall change. Higher after a night in a sleep lab setting the CPAP pressure (about 4.3 mmHg) and with long-term use (about 0.5 mmHg). No change in nerve fiber layer thickness. | Small studies with mixed designs |
| Hirunpatravong and colleagues, 2019 [17] | 6 people (12 eyes) with open-angle glaucoma and new OSA, followed for 12 months | Average pressure rose from about 17.8 to 19.1 mmHg. One person needed added glaucoma medicine. No glaucoma progression was found. | Very small; only 1 year |
Eye pressure is measured in millimeters of mercury (mmHg). The Kongchan review also found a small drop in ocular perfusion pressure, which is the pressure that pushes blood into the eye [4].
Both review teams advised caution and closer attention to eye pressure when people with glaucoma use CPAP [3,4]. Read more about what eye pressure numbers mean.
The pressure setting on your CPAP machine is air pressure in your airway. It is not your eye pressure, and you cannot work out one from the other.
No. Do not stop CPAP, skip nights or lower the setting yourself. Untreated sleep apnea raises the risk of stroke, heart attack and drowsy-driving crashes. In two eye studies, not using CPAP for moderate to severe OSA was linked with a higher risk of NAION in the second eye [6,9,13,18].
The American Academy of Sleep Medicine strongly recommends positive airway pressure (PAP) for adults with OSA and excessive sleepiness. It also stresses follow-up and troubleshooting after treatment starts [8].
If you have glaucoma, here is what to do instead:
NAION (non-arteritic anterior ischemic optic neuropathy) is a sudden loss of blood flow to the front of the optic nerve. It usually causes painless vision loss in one eye. Sleep apnea is a strong risk factor: a 2016 review found about six times the odds of NAION in people with OSA [5,12].
NAION is different from glaucoma, although both damage the optic nerve. In more than 70% of cases, people first notice the vision loss on waking. No treatment has been proven effective, so care focuses on controlling risk factors to protect both eyes [12].
Sleep apnea is very common in people with NAION:
These are observational studies, so they cannot prove that CPAP prevents NAION. They are still a strong reason to keep using CPAP. Learn more about NAION.
Floppy eyelid syndrome means the upper eyelids are loose and flip up easily. It causes ongoing eye irritation, redness and discomfort. A 2023 review found that people with OSA had almost twice the odds of floppy eyelid syndrome, and the risk rose with OSA severity [7,19].
In that review, people with severe OSA had about three times the odds [7]. Another review found that 57% of people with floppy eyelid syndrome had OSA. Many learned they had sleep apnea only when they were studied [20].
Floppy eyelid syndrome has also been linked with glaucoma and keratoconus, a thinning and bulging of the cornea [19,20]. Treatment may include [19]:
If an eye doctor tells you that you have floppy eyelids, ask your primary care doctor about a sleep evaluation [20].
Yes. CPAP can dry the eyes, especially when air leaks from the mask. The National Heart, Lung, and Blood Institute lists dry eyes among PAP side effects and mask leaks among problems to report. A poor fit is usually fixable, so tell your sleep team instead of stopping treatment [13,16].
In one study of 40 people, tears broke up faster and eye irritation increased after 4 months of CPAP [21]. Your sleep team may suggest a different mask or nasal pillows, a humidifier, or adjusted settings [13].
Your eye doctor can check for dry eye or floppy eyelids and suggest lubricants. Our article on waking up with dry eyes covers other causes and fixes. Dry, irritated eyes are not a sign that your glaucoma is getting worse, but they still deserve treatment.
Share information both ways. Your eye doctor should know when CPAP starts or changes. Your sleep doctor should know you have glaucoma. Neither team should change the other team's treatment without talking first.
Sleep apnea is one of several glaucoma risk factors beyond pressure. See our guide to glaucoma risk factors beyond eye pressure.
Netra Restoration Therapy (NRT) is offered as adjunctive care, meaning support alongside your medical treatment. NRT has not been tested in controlled trials for glaucoma, sleep apnea, NAION or floppy eyelid syndrome. It does not treat, reverse or cure these conditions.
NRT never replaces CPAP, glaucoma drops, laser or surgery. Keep every appointment with your sleep and eye doctors, and do not delay standard care. You can read what Netra Restoration Therapy involves and what is known about its effectiveness.
Sleep apnea is linked with glaucoma, but it has not been proven to cause it. A 2023 review of 48 studies found that people with obstructive sleep apnea had higher odds of glaucoma. After adjusting for other health problems, the odds were up to about 40% higher. The studies varied widely, so the link may partly reflect shared risk factors.
Yes, CPAP can raise eye pressure slightly in some people. One recent review found rises overnight and during the first month, with no change after that. Another review found a small rise with long-term use. No study has shown that CPAP makes glaucoma worse.
No. Untreated sleep apnea raises the risk of stroke, heart attack and drowsy-driving crashes. Keep using CPAP as prescribed and tell your eye doctor when you start or change it. If your eye pressure rises, your glaucoma treatment can be adjusted while your sleep apnea stays treated.
A CPAP mask can cause dry, irritated eyes, especially if air leaks toward the eyes. A better-fitting mask, a different mask style or a humidifier often helps. Tell your sleep team about leaks and your eye doctor about ongoing irritation, and do not stop treatment on your own.
Floppy eyelid syndrome means the upper eyelids are loose and flip up easily, causing ongoing irritation and redness. It is strongly linked to sleep apnea: in one review, more than half of people with floppy eyelids had sleep apnea. If you are diagnosed with floppy eyelids, ask your doctor about a sleep evaluation.
Sleep apnea is a strong risk factor for NAION, a sudden loss of blood flow to the optic nerve. NAION usually causes painless vision loss in one eye, often first noticed on waking. Any sudden vision loss needs emergency eye care the same day.
Not automatically. The need for a sleep study depends on symptoms such as loud snoring, pauses in breathing, gasping or daytime sleepiness, plus your overall health. Tell your doctor about these symptoms and mention your glaucoma, especially if it is getting worse despite good eye pressure.
No. Nerve damage from glaucoma cannot be undone, and there is little evidence on whether treating sleep apnea slows glaucoma. CPAP treats the breathing problem, and glaucoma still needs its own pressure-lowering treatment and regular testing.
Sources checked October 31, 2026.
This article provides general education and does not replace an individual eye examination, diagnosis or treatment plan. Sudden vision loss in one or both eyes, even if painless or first noticed on waking, or a sudden painful red eye needs emergency eye care the same day.
